Porous or hollow carbonaceous sphere-like particles (frequently in the size range
of a few to several hundreds of µ m diameter) formed during pyrolysis
, also in the course of combustion, of carbonaceous liquid droplets (e.g. heavy fuel)
or solid particles (e.g. coal).
PAC, 1995, 67, 473
(Recommended terminology for the description of carbon as a solid (IUPAC Recommendations
on page 480
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook